<!DOCTYPE html>
<html lang="zh">
<head>
    <script type="text/javascript">
        function loadXMLDoc() {

        }
    </script>
    <meta charset="UTF-8">
    <title>demo</title>
</head>
<body>
<div id="myDiv">
    <h3>Let Ajax change this text</h3>
</div>
<button type="button" onclick="loadXMLDoc()">
    Change the Content
</button>
</body>
</html>